Tension mechanism.



'J. A. GROBBLI.

TENSION MEGHANISM. nruouron num :n.zs, lem.

Patented Junel29, 1909.

.\ CORPURATIUX Ol" NEW YORK.

Tension MECHANISH. l

Specification of Letters Patent.

Patented June 29. 1909,

Application tiled January 28, 1907. Serial No. 354,357.

flo all 'whom -it 'may co'ncram:

I e it known that l, Josizrn A. Gaoeeu, a citizen of.,the United States. residmug in the city, county, and State of New Yoisk, havev invented new and .useful Imprmements in 'lcnsion Mechanism, of which` the following is a specification.

My invention relates to tension mechanism especially applicable to embroidering ma; chiites, although it may be used in connection with other characters of machines.

My invention in the form shown by way of illustration in the. drawing consists in l mechanism suitably operated and exerting a variable tension upon the threads.

The mechanism may he 'ariously operated either by hand as shown, or automatically by pattern or jacquard mechanism. A type of mechanism suitable for the purpose is shown m Patent No. 593,207, for embroidering machine.. dated November 9, 1897, granted to the Knrshecdt Manufacturing Company' as myassignee.

It will he understood that the mechanism shown is but one form of my invention and will he s ieciiicall y described without limiting myself thereto. v

In the drawings-Figure l is a broken away" plan View of a needle rail carriage of an emhroidcring machine with take up and tension mechanism forming part of this invention: Fi". 3 is a side elevation ot' thc mechanism shown in Fig. 1: Fig. 3 is detail view of part. of'thc tension mechanism showing the rariahlc tcusion device with which V'the thioads (-otipi-.ralc in a position diti't-rcn't from that shown in Figs. l'and 2:--and, Fig. 4 is a side elevation of a different form of needle and take up mechanism in combination with thc variable tension.

In Figs: 1 and A indicates themefahlc carriage which cari-ics the needle, take up.

and tension devices.

The needle rail u carries thc noodles Carried also hy thc carriage A is a spoolycst supporting rotary spoois Il. .`\v take-up hat* or wire 1.' is carried on arms f on the rock shaft y, which rock hal't. is op( 'ated in any l suitable or ordinary manner. .Located prefcrably between thc spool and the take up is u variable tension device indicati-d generally by the letter h. This tension dcvicc may assume a multitude of forms, not herein illustrated. In the present instance the variable tension is shown as consisting of a plurality of wircsdiars, rods or tubes i or their oqu'ii'- alcnts capable hy movement to increase or v decrease thel extent of contact of the threads cirennicrentiaily or pfifripiierally with the said hars. The rods are also shown h v way of exampie as round :ihdhaviiig their axes in fixed relation to cach other during;r all the movements of the variable tension.

The har j is in the present ins-taime a rot atalile shaft carried in bearings Z (only onc of 6 which is shown) and carries disks or arms m at intervals tl'iercon, which disks er arms carry the har 'i whose asis is at a fixed distance from tht` axis of bar In Figs. l and 2 the bars are shown in one position aiid in Fig. 2 the)Y are shown as. swim Y into auother position where a greater cngth of thread r presses against the peripheral surfaces of the bars. This will increase the tension on the threads. The harj thus rotates 7 on its axis and the liar 'e' reiolvcs about thc axis of the oar As thc har i in this instance shown maintained in :i fixed position with respect to the bar j il docs not revolve about the bar huttonly about the axis ot' S thel said bar Rotary movement is immo-ted to thc har jin any suitable manner as inc-.ins oi a piuion n and a worm o. The worin o is cari-'unl on an upright shaft y: having an adjusting 3 arm g which may he operated oy hand or` otherwise. (lr the shaft. or 'oarj may bc c,.\'- tended as shown in dotted lines in Fig. l or otherwise arranged or connected to readily" accommodate it for. connection with thc jact nai-d adjusting mechanism. Means for lira 'ing the spools in their rotation are piovidod, shown in thc prose-nt instance, as a rock shaft '8, suitably l( :ated with rcs )ect t0 thc spools and carrying,` a series of'hlades t 9 adapted to he broughtl against the respective spools in any ordinary or usual manner.

ln 4 I have shown aoothcrconstruction wherein the necdh` rails a are carried hy reciprocating slides 1v carried in hearings V, and coiipcrating with-a plurality ot' take up hars or wires c i' which are suitably operated in any of the well known ways.

The variable tension h is, as neforc, combined with thc take up motion and is in adl Vance thereof and between the same and the spool d. The mode of operation of the mechanisms described and illustrated will: be obvious from the said description and illu-stravtion. I v. no

t f Haze -1 :manif t Having Ie-eribed my invention what 1f' daim mili feire to secure by Letters Paten( iS:

An emlmiidexing nmvhne embodying a! needle.Mechanism. :i tension device, emnprising a pini-:willy oi' friction bars with the pew ich bars i.-: located in a fixed position with relation to the path of the thread from the supply :unl means for movinir the other of said bars about the axis of t. :e first bar lo f change the extent of peripheral contactl ofi x'i'iierier; of which iie threads contact,one of i the thread with Suid bars und luke up nieu n :mism for @aid thleml interposed so :is to act upon lhetiireaiz between the needle mechanism and said stationary tension bur.

`Signed :u New York, in the count und State of New im-k, this 26th day u. Jannary, 190?.

JOSEPH A. GROEBL.

"ilnesses A. H. Kuksmznr, GEO. E. MURSE. 

